准噶尔盆地南缘和东缘二叠系高分辨层序地层研究
发布时间：2018-07-22 14:41
【摘要】：论文依托“准噶尔盆地南缘和东缘地区二叠系—侏罗系野外地质考察及沉积特征研究”项目,在广泛收集前人地层、沉积等相关资料的基础上,通过野外露头剖面实测以及室内资料分析,研究了该区二叠系沉积特征及其构造意义,取得以下主要成果和认识:1、通过4条实测地层剖面的深入研究,建立了准噶尔盆地南缘和东缘二叠系完整的地层序列。2、根据四射珊瑚、蜓类化石鉴定结果,认为准噶尔盆地南缘石人子沟组的时代为晚石炭世,而不是前人认为的早二叠世。3、通过剖面岩石类型、沉积构造及含化石特征分析,将准噶尔盆地南缘和东缘二叠系划分为普遍发育的辫状河流相、辫状河三角洲相和湖泊相三种主要沉积相类型,以及仅见于准噶尔南缘的下二叠统陆源碎屑滨浅海相,并对各种相类型的亚相、微相及沉积特征进行了深入研究。4、根据准噶尔盆地南缘和东缘二叠系露头高分辨层序地层学研究,建立了不同级别层序的识别标志,划分了各剖面的短期基准面旋回(五级层序)、中期基准面旋回(四级层序)和长期基准面旋回(三级层序)。在准噶尔盆地南缘的二叠系划分了7个三级层序;在准噶尔盆地东缘的二叠系划分了2个三级层序。5、通过剖面对比,建立了准噶尔盆地南缘和东缘二叠系的综合地层格架和沉积格架,结合前人资料,以世为单位编制了准噶尔盆地东部沉积古地理图3张。6、综合以上研究,探讨了准噶尔盆地东部构造-沉积演化历史,认为准噶尔盆地南缘和东缘二叠纪的沉积历史存在着明显的差异。首先,两侧山脉开始隆升的时间不同,南缘在早二叠世为残余海盆、中二叠世海水彻底退出并演化为深水湖盆,发育了厚层油页岩,说明此时博格达山脉尚未开始隆升;而准噶尔盆地东北缘的卡拉麦里山自早二叠世便已经开始隆升,造成盆地东缘的二叠系早期地层的缺失和后期辫状河-辫状河三角洲相的粗碎屑沉积的广泛发育。其次,南缘和东缘二叠纪的山脉隆升的节律也不同,盆地南侧的博格达山脉和北侧的卡拉麦里山脉隆升演化历史的差异是造成准噶尔盆地两侧沉积盆地二叠系的充填序列、岩性岩相、沉积厚度等方面差异的根本原因。
[Abstract]:Based on the project of "Field Geological investigation and Sedimentary characteristics Research of Permian-Jurassic system in the Southern margin and Eastern margin of Junggar Basin", the paper collects the related data of previous strata, deposits and so on. In this paper, the sedimentary characteristics and tectonic significance of Permian system in this area are studied through field outcrop profile measurement and indoor data analysis. The following main achievements and understandings are obtained, and further research on 4 measured stratigraphic sections is made. The complete stratigraphic sequence of Permian in the southern margin and eastern margin of Junggar Basin was established. According to the results of the identification of the Quaternary corals and the fossils, it is considered that the age of the Shirenzigou formation in the southern margin of Junggar Basin is the late Carboniferous. By analyzing the rock types, sedimentary structures and fossilized features of the section, Permian in the southern and eastern margin of Junggar Basin is divided into generally developed braided fluvial facies. Braided river delta facies and lacustrine facies are three main sedimentary facies types, as well as the lower Permian continental clastic shoreline facies in the southern margin of Junggar, and the subfacies of various facies types. The microfacies and sedimentary characteristics are studied in depth. Based on the study of high-resolution sequence stratigraphy of Permian outcrops in the southern margin and eastern margin of Junggar Basin, the identification criteria of different sequences are established. The short-term base-level cycles (five-grade sequences), the intermediate base-level cycles (quarter-order sequences) and the long-term base-level cycles (third-order sequences) of each profile are divided. The Permian in the southern margin of Junggar Basin is divided into 7 third-order sequences, and in the eastern margin of Junggar Basin, two third-order sequences. The Synthetical stratigraphic framework and sedimentary framework of the Permian system in the southern and eastern margin of Junggar Basin were established. Combined with the previous data, the sedimentary paleogeography map of the eastern Junggar Basin was compiled in the unit of epoch. The history of tectonic-sedimentary evolution in the eastern Junggar basin is discussed. It is considered that there are obvious differences in the sedimentary history of the Permian period between the southern margin of Junggar basin and the eastern margin of Junggar basin. First of all, the time when the mountains on both sides began to uplift was different. The southern margin was a residual basin in the early Permian, and the middle Permian sea water completely exited and evolved into a deep-water lake basin, which showed that the Bogda Mountains had not started to uplift at this time. The Calamari Mountains in the northeastern margin of Junggar Basin have been uplifted since the early Permian, resulting in the absence of early Permian strata in the eastern margin of the basin and the extensive development of coarse detrital deposits in the late braided fluvial braided river delta facies. Secondly, the rhythm of the Permian mountain uplift in the southern margin and the eastern margin is also different. The difference in the evolution history of the Bogda Mountains on the southern side of the basin and the Karamari Mountains on the north side of the basin is the filling sequence of the Permian sedimentary basins on both sides of the Junggar basin. The fundamental cause of the difference in lithology, lithofacies and sedimentary thickness.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P539.2
本文编号：2137794
[Abstract]:Based on the project of "Field Geological investigation and Sedimentary characteristics Research of Permian-Jurassic system in the Southern margin and Eastern margin of Junggar Basin", the paper collects the related data of previous strata, deposits and so on. In this paper, the sedimentary characteristics and tectonic significance of Permian system in this area are studied through field outcrop profile measurement and indoor data analysis. The following main achievements and understandings are obtained, and further research on 4 measured stratigraphic sections is made. The complete stratigraphic sequence of Permian in the southern margin and eastern margin of Junggar Basin was established. According to the results of the identification of the Quaternary corals and the fossils, it is considered that the age of the Shirenzigou formation in the southern margin of Junggar Basin is the late Carboniferous. By analyzing the rock types, sedimentary structures and fossilized features of the section, Permian in the southern and eastern margin of Junggar Basin is divided into generally developed braided fluvial facies. Braided river delta facies and lacustrine facies are three main sedimentary facies types, as well as the lower Permian continental clastic shoreline facies in the southern margin of Junggar, and the subfacies of various facies types. The microfacies and sedimentary characteristics are studied in depth. Based on the study of high-resolution sequence stratigraphy of Permian outcrops in the southern margin and eastern margin of Junggar Basin, the identification criteria of different sequences are established. The short-term base-level cycles (five-grade sequences), the intermediate base-level cycles (quarter-order sequences) and the long-term base-level cycles (third-order sequences) of each profile are divided. The Permian in the southern margin of Junggar Basin is divided into 7 third-order sequences, and in the eastern margin of Junggar Basin, two third-order sequences. The Synthetical stratigraphic framework and sedimentary framework of the Permian system in the southern and eastern margin of Junggar Basin were established. Combined with the previous data, the sedimentary paleogeography map of the eastern Junggar Basin was compiled in the unit of epoch. The history of tectonic-sedimentary evolution in the eastern Junggar basin is discussed. It is considered that there are obvious differences in the sedimentary history of the Permian period between the southern margin of Junggar basin and the eastern margin of Junggar basin. First of all, the time when the mountains on both sides began to uplift was different. The southern margin was a residual basin in the early Permian, and the middle Permian sea water completely exited and evolved into a deep-water lake basin, which showed that the Bogda Mountains had not started to uplift at this time. The Calamari Mountains in the northeastern margin of Junggar Basin have been uplifted since the early Permian, resulting in the absence of early Permian strata in the eastern margin of the basin and the extensive development of coarse detrital deposits in the late braided fluvial braided river delta facies. Secondly, the rhythm of the Permian mountain uplift in the southern margin and the eastern margin is also different. The difference in the evolution history of the Bogda Mountains on the southern side of the basin and the Karamari Mountains on the north side of the basin is the filling sequence of the Permian sedimentary basins on both sides of the Junggar basin. The fundamental cause of the difference in lithology, lithofacies and sedimentary thickness.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P539.2
【参考文献】
相关期刊论文 前2条
1 李兴平,李静琏,王国司;准噶尔盆地东部五彩湾地区层序框架[J];石油实验地质;1997年01期
2 邢焕清;;准噶尔盆地侏罗系层序地层研究展望[J];石油实验地质;2006年01期
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